ROKSAN ROK-DA1

Commentary

D/A converter unit exclusively for 75 Ω coaxial digital input developed with CD Transport ROK-DP1.

The signal board is fixed directly inside the rear panel to guide the input signal to the circuit at the shortest distance and to send it out at the shortest distance.
In addition, in order to avoid degradation of sound quality due to wiring and switch contact, etc., input is one coaxial system and output is one analog system only.

The power supply of the toroidal transformer is mounted on the part of the under chassis, and the position where the interference with the signal system is minimized is selected and fixed. Moreover, the digital part and the analog part are separated to suppress mutual interference.

The D/A converter / A converter is a 1-bit type of 64 x oversampling delta-sigma system manufactured by Crystal Semiconductors, Inc. of the United States. The power and ground patterns of the digital and analog sections are completely independent of each other, reducing interference between digital and analog circuits through the power and ground lines.

The digital circuit is equipped with an 8 x oversampling digital filter.

In addition to 44.1 kHz sampling frequency, 48 kHz and 32 kHz signals are also available.

The ROK-DA1 signal board can be easily replaced to accommodate future upgrades.

As a separately sold option, there was an external power supply unit to further enhance the sound quality of ROK-DA1.

Model Rating

Type	D/A converter
Input	Coaxial digital : 1 system
Output	Analog : stereo1 system
Sampling frequency	32 kHz, 44.1 kHz, 48 kHz (automatic)
Dynamic range	97dB
Signal-to-noise ratio	126dB
S / (N + D) ratio	94dB
Phase deviation	± 0.5 degrees
Channel separation	100 dB or more
DC Offset	Within ± 1 mv
Rated output	2.0Vrms
Pwer	100 VAC, 50Hz/60Hz
Power consumption	10W max.
External dimensions	Width 215x Height 80x Depth 325 mm
Weight	3kg
Sold Separately	External Power Supply Unit ROK-DS1 (¥ 280,000)